[Solved]-d3.ticks() in d3 v4 often gives a top tick value lower than the highest value in the range-d3.js

Try this

getRoundedYMaxValue(number) {
        var numLen = number.toString().length;
        var dividerValue = "1"
        for (var i = 0; i < numLen - 1; i++) {
            dividerValue += 0
        }
        return Math.ceil(number / dividerValue) * dividerValue
    }